UASB工艺处理高浓度Vc生产废水的试验研究

采用UASB反应器对高浓度Vc生产废水进行了实验室处理研究。试验结果表明:Vc废水的厌氧处理运行性能因水质不同而存在很大差异。转化母液的容积负荷在8kg COD.m-3d-1以下时,去除率基本稳定在65%以上。当负荷继续提高时,去除率会急剧下降并保持在50%左右。精制母液和提取母液的容积负荷在10kgCOD.m-3d-1时去除率仍能稳定在70%以上。这些表明当两套反应系统的容积负荷控制在一定范围时,UASB反应器可以有效去除大部分的有机污染物。同时也说明转化母液废水中存在相当数量的难生物降解化合物。GC/MS水质分析结果表明,其中含有大量10C以上的长直链或双苯环等结构的难生物降解物。系统中厌氧颗粒污泥的产甲烷活性随着反应器中污泥驯化的进行和负荷的增加而上升。     

上流式厌氧污泥床处理豆制品废水启动研究

用上流式厌氧污泥床（ＵＡＳＢ）处理豆制品废水，以阐明这种消化器启动的效果。研究结果表明，产气率，ＣＯＤ去除率和甲烷含量分别为３．０Ｌ／（Ｌ．ｄ），９３％，５８．４％。从第２６天至４６天的运转期间，ＵＡＳＢ平均ＣＯＤ负荷率、产气率，ＣＯＤ去除率，甲烷含量分别为５．２ｇＣＯＤ／（Ｌ．ｄ），３．５Ｌ／（Ｌ．ｄ），９０％，５９．４％。出水乙酸，丙酸浓度分别为１１１ｍｇ／Ｌ，９８ｍｇ／Ｌ，丁酸浓度不可测出。     

沈阳北部污水处理厂污泥土地利用可行性研究

采用污泥田间小区试验及污泥渗漏试验的方法,开展了沈阳北部污水处理厂污泥土地利用可行性研究.结果表明,沈阳北部污水处理厂污泥中N、P、K养分含量丰富,污泥中的Cd元素是污泥土地利用的主要限制因素.通过污泥土地利用限制因素法,确定了沈阳北部污水处理厂污泥总施用量为45 t·hm^-2.污泥渗漏、田间试验结果表明,只要污泥总施用量控制在45 t·hm^-2,NO3-N不会对地下水构成污染危害,土壤中的重金属含量也不会超过二级土壤环境质量标准,污泥可安全地进行土地利用.     

Agronomic Traits of Corn Fertilized with Sewage Sludge

Although research on the environmental impacts of using waste as a fertilizer is of great importance, the basic principle for using a product as fertilizer is that it should provide nutrients for plants without causing any harm to them. The objective of this study was to evaluate the agronomic traits (number of nodes, plant height, leaf number, yield, and protein content of grains) and the nutritional status of corn treated with sewage sludge. The experiment was conducted in the municipality of Jaboticabal in a Red Latosol. A randomized block design with four treatments (0, 55, 110, and 167.5 Mg ha^?1 of sewage sludge) and five repetitions was used. At 30 days after emergence (DAE), the dose of 110 Mg ha^?1 dry weight presented greater values for plant height, leaf number and stem diameter. At 60 DAE, the treatments did not affect the agronomic traits. No influence from the treatments tested was observed for protein content of grains and yield. The dose of 167.5 Mg ha^?1 showed greater weight of 100 seeds. All treatments showed nutritional imbalances. This study confirmed the agricultural potential of sewage sludge as a source of nutrients.     

微生物菌剂对兰州城市生活污泥堆肥效果的影响

以兰州市城市生活鲜污泥和40%干污泥为原料，以玉米秸秆为辅料，添加金宝贝生物发酵剂和阿姆斯生物发酵剂进行堆肥，研究微生物菌剂对堆肥过程中温度、含水率、NH₄₊ N、NO₃^- N和全N的影响。结果表明，除鲜污泥（D 1，CK）处理外，其他各处理堆体温度保持在50 ℃以上均超过7 d，达到堆肥卫生标准，加入微生物菌剂使堆体提前5 d达到50 ℃；其他各处理经过20 d堆置含水率降至45%以下，达到园林绿化使用标准；加入微生物菌剂使堆体全N损失增加0.56%~4.47%，并促进NH₄₊ N的生成和NO₃^- N的积累。     

Effect of zinc levels on phosphorous and zinc content in sand‐cultured soybeans

Soybeans (Glvcine max L.) cv. “Clark”; were grown in the greenhouse in sand‐filled plastic pots sub‐irrigated with Hoagland No. 1 solution to determine the possible inhibitory effects of Zn on the uptake of P. Zinc rates used were 0.05 (control), 0.25, 0.5 and 2.5 ppm. Yields equalled the control at Zn levels of 0.25 and 0.5 ppm, but plants grown in solutions containing 2.5 ppm Zn were stunted severely. Foliar Zn and P levels differed very little among Zn treatments. Zinc levels were highest and P levels were lowest, however, in the roots and stems of soybeans grown in solutions of 2.5 ppm Zn. Zinc and P uptake was significantly inhibited in the leaves, stems and roots of plants grown at the highest Zn rate. The recycling of wastes containing high Zn content could adversely affect plant growth by a suspected antagonism with P.     

浅议市级图书馆服务少年儿童读者

结合市级图书馆的实际和少年儿童读者的特点,就市级图书馆为少年儿童读者服务的问题进行阐述,指明了素质教育背景下市级图书馆儿童读者工作的重要性及发展方向。     

地下室排水系统的设计研究

随着城市建设的发展,地下空间得到了更多的开发和利用。由于各种设计手册和教科书中对关于“地下室排水系统设计”的篇幅较少。为此根据多年的设计经验,总结了不同情况下地下室排水系统设计方法,并对设计中易出现的问题提出了注意事项。     

城镇净化沼气池残渣还田处理试点研究

通过对城镇生活污水净化沼气池残渣与农村沼气池沼渣性质的分析比较及农田土壤成分的分析，提出了城镇净化沼气池残渣还田处理研究。在连续三年对小麦，油菜施用城镇净化沼气池残渣还田处理效果研究的基础上，总结出了实用的施用技术。     

浅谈市政道路石灰土基层施工

笔者从石灰土在道路施工中的重要性出发,分析市政道路石灰土基层施工的前期准备工作,并介绍了市政道路石灰土基层施工工艺流程,最后分析了特殊季节道路石灰土基层施工的注意事项。